CN103280433B - A kind of sun power alternating current power-generating system, invertor and stationary installation thereof - Google Patents

Abstract

The invention discloses a fixing device, which includes a main body, the main body presses and fixes the fixed part to the bearing part through a threaded assembly, and the main body is also provided with at least one positioning boss to limit the relative position of the main body relative to the The rotation of the fixed part. Compared with the prior art, the fixing device provided by the present invention can quickly, conveniently and accurately fix it to the carrier by using the positioning effect of the positioning boss on the fixed part, thereby reducing the labor intensity of the operator and improving its working efficiency. On this basis, the invention also discloses an inverter including the upper fixing device, and a solar AC power generation system including the above inverter.

Description

A solar AC power generation system, an inverter and its fixing device

technical field

The invention relates to the technical field of solar photovoltaic power generation, in particular to a solar power generation system, an inverter and a fixing device thereof.

Background technique

The solar AC power generation system mainly includes solar cell components, controllers, batteries and inverters, among which the function of the inverter is to convert the DC power generated by the solar photovoltaic components into AC power. IGBT (Insulated Gate Bipolar Transistor) is the core component of the inverter, and the inverter function is completed by turning on and off the power electronic switch.

The temperature characteristic of IGBT is very obvious. As the substrate temperature increases, its power dissipation and collector current drop sharply. When the IGBT operating temperature exceeds the operating temperature limit of 125°C, the IGBT will be permanently damaged due to overheating, which will affect the normal operation of the inverter. Therefore, in order to prevent the IGBT from being damaged due to excessive temperature and ensure its stable and reliable operation, a heat sink is usually required in the inverter. As shown in Figure 1, the IGBT1' is fixed to the heat sink 3' of the heat sink through the fixing device 2'. When the pressing force of the fixing device 2' is applied to the corresponding surfaces of the two, the working temperature of the IGBT1' is lowered to protect the temperature of the IGBT from exceeding a certain limit value, thereby improving the working efficiency of the inverter and prolonging its service life.

The fixing device 2' is a sheet metal structure bent into a stepped shape. When installing IGBT1', first weld the IGBT and the lead terminals of the solar photovoltaic module, and then use the elastic force of the metal of the fixing device 2' to press through the screw 4' to make the IGBT1' and the corresponding surface of the heat dissipation base plate 3' fit together. When fixing the IGBT1' through the fixing device 2', the operator first needs to align the pressing part of the fixing device with the main body of the IGBT before tightening the screw. In order to prevent the fixing device from rotating with the screw, the operator needs to hold the Fix the device until the back of the IGBT 1' is completely attached to the heat dissipation bottom plate 3'. Apparently, using the above-mentioned fixing device to fix the IGBT not only has the problem of poor operability.

In view of this, a fixing device suitable for pressing and fixing the fixed part (IGBT) to the carrier (radiating device) is provided to quickly and accurately press and fix the fixed part to the carrier ( Radiation bottom plate) is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

In view of the above-mentioned defects, the core purpose of the present invention is to provide a fixing device through which the fixed part can be quickly, conveniently and accurately fixed to the bearing part, thereby improving the operability of the fixing part installation process and reducing the operation The labor intensity of the operator is improved, and the work efficiency is improved. On this basis, the present invention also provides an inverter including the upper fixing device, and a solar AC power generation system including the above inverter.

A fixing device provided by the present invention includes a main body, the main body presses and fixes the fixed part to the carrier part through a threaded assembly, and it is characterized in that the main body is also provided with at least one positioning boss to limit the The rotation of the main body relative to the fixed part.

Preferably, along the screwing direction of the screw assembly, the diameter of the positioning boss decreases gradually.

Preferably, along the screwing direction of the screw assembly, the positioning boss is provided with a groove.

Preferably, the shape of the main body is square, the threaded hole matching the threaded assembly is opened in the middle of the main body, and the number of the positioning bosses is arranged symmetrically with respect to the axis of the mounting hole two.

Preferably, the contact surface between the main body and the fixed part is an arc surface.

Preferably, the arc surface is tangent to the middle of the fixed part.

Preferably, along the length direction, both ends of the main body are provided with a first reinforcing rib and a second reinforcing rib.

Preferably, the length of the first reinforcing rib is a safe installation distance between two adjacent fixed parts.

Preferably, the main body is made of plastic.

The present invention also provides an inverter, including an IGBT and a heat sink, the IGBT is fixed to the heat sink through a fixing device, and the fixing device is specifically the fixing device as described above.

The present invention also provides a solar AC power generation system, including a solar photovoltaic module, a controller, an electric storage device and an inverter, and the inverter is specifically the above-mentioned inverter.

With respect to the above-mentioned background technology, the present invention provides a fixing device, which includes a main body, the main body presses and fixes the fixed part to the bearing part through a threaded assembly, and the main body is also provided with at least one positioning boss to limit the main body relative to the fixed part. rotation of the piece.

When the fixed part is installed on the carrier part, the positioning boss of the fixing device is firstly inserted into the positioning hole of the fixed part, and then the fixed part is fixed on the carrier part through the screw assembly.

Compared with the prior art, the fixing device provided by the present invention can quickly, conveniently and accurately fix the fixed part to the bearing part by using the fixing and positioning effect of the positioning boss on the fixed part, thereby reducing the operator's labor Strength, improve its work efficiency. In addition, after being fixed and positioned by the positioning boss, the rotation of the fixing device relative to the fixed part is prevented during the process of tightening the threaded assembly, and a relatively uniform pressing force is provided for the fixed part, and the fixed part is fixed under the action of the pressing force. The corresponding surfaces of the parts and the carrier parts can be completely fitted. .

In a preferred solution of the present invention, the main body is square in shape, the threaded hole matching the threaded assembly is opened in the middle of the main body, and the number of positioning bosses is an even number arranged symmetrically with respect to the axis of the mounting hole. With the fixing device of this structure, the operator can install multiple fixed parts on the carrier part through only one operation, thereby further reducing the labor intensity of the operator and further improving the work efficiency.

Description of drawings

Fig. 1 shows the schematic diagram of the assembly of IGBT and heat dissipation bottom plate in the prior art;

FIG. 2 shows a schematic structural view of a specific embodiment of the fixing device provided by the present invention;

Fig. 3 shows a schematic diagram of the assembly of the fixing device shown in Fig. 2 and the IGBT;

FIG. 4 shows an exploded schematic view of the assembly schematic diagram of FIG. 3 .

In Figure 2 to Figure 4:

1 fixing device, 11 main body, 111 threaded hole, 112 positioning boss, 112-1 groove, 113 first reinforcing rib, 114 arc surface, 115 second reinforcing rib, 2 IGBT, 21 positioning hole, 3 screws.

detailed description

The core of the present invention is that the core purpose of the present invention is to provide a fixing device, through which the fixed part can be quickly, conveniently and accurately fixed to the bearing part, thereby reducing the labor intensity of the operator and improving its work efficiency. efficiency. On this basis, the present invention also provides an inverter including the upper fixing device, and a solar AC power generation system including the above inverter.

Without loss of generality, in conjunction with the accompanying drawings, the fixing device provided by the present invention is used to press and fix the IGBT (fixing part) of the inverter to the heat sink (carrier) as an example to illustrate the provision of the present invention. A specific embodiment of the fixture. Of course, in addition to the IGBT in the above-mentioned inverter, the fixing device can also be used to compress and fix MOS tubes and similar tube components to bearings such as heat sinks.

Please refer to Fig. 2, Fig. 3 and Fig. 4, wherein, Fig. 2 shows the structural schematic diagram of a specific embodiment of the fixing device for inverter IGBT provided by the present invention, and Fig. 3 shows the structure shown in Fig. 2 The schematic diagram of the assembly of the fixture and the IGBT, Figure 4 shows an exploded schematic diagram of the schematic diagram of the assembly in Figure 3 .

As shown in Figure 2 and Figure 4, the fixing device 1 provided by this solution for pressing and fixing the IGBT of the inverter to the heat sink of the inverter includes a main body 11, and the main body 11 is provided with a threaded hole 111, through which The screw 3 matched with the threaded hole 111 presses and fixes the IGBT2 to the heat sink, and also includes a positioning boss 112 provided on the main body 11, and the positioning boss 112 is used to position the IGBT2 to limit the position of the main body 11 relative to the IGBT2. turn.

When fixing the IGBT2 and the heat sink, first insert the positioning boss 112 of the fixing device 1 into the positioning hole 21 of the IGBT2, and then fix the IGBT2 to the heat sink by screws 3 .

Compared with the prior art, this solution utilizes the positioning effect of the positioning boss 112 on the IGBT2 to quickly, conveniently and accurately fix the IGBT2 to the heat sink, thereby improving the operability of the IGBT2 installation process and reducing the labor of the operator. Strength, improve its work efficiency. In addition, after being fixed and positioned by the positioning boss, the rotation of the fixing device 1 relative to the IGBT2 during the screw tightening process is prevented, and a relatively uniform pressing force is provided for the IGBT2. Under the action of the pressing force, the heat dissipation of the IGBT2 and the heat sink The corresponding surfaces of the bottom plate can be completely bonded, thereby maximizing the heat dissipation effect of the IGBT, thereby optimizing the working efficiency of the IGBT and prolonging its service life.

It should be noted that, in order to adapt to the positioning hole 21 of the IGBT2 shown in FIG. 4, the specific shape of the positioning boss 112 in this solution is a circular platform, and the diameter of the circular platform decreases gradually along the tightening direction of the threaded assembly. This structure prevents the jamming problem when the positioning boss 112 is inserted into the positioning hole 21 . In addition, along the axial direction of the threaded hole 111, the positioning boss 112 is provided with a groove 112-1. The diameter changes, so that its adaptability can be improved, and the positioning hole 21 can be prevented from causing damage to the internal functional components of the IGBT due to extrusion deformation, thereby affecting its normal operation.

It can be understood that the positioning boss in the present invention can also have other shapes on the basis of meeting the technical requirements and realizing the positioning function requirements, and matching with the positioning hole of the IGBT2.

Further, please continue to refer to Fig. 2, the specific shape of the main body 11 of the fixing device 1 provided by this solution is a rectangle, the threaded hole 111 is opened in the middle of the main body 11, and the number of positioning bosses is symmetrically arranged relative to the axis of the threaded hole of two. Through this fixing device, the operator can quickly, conveniently and accurately complete the installation of two IGBT2s at the same time during one operation, thereby further improving its work efficiency. Please refer to Figure 3 for the specific assembly structure schematic diagram. In addition, by opening the threaded hole 111 in the middle of the main body 11 and making the two positioning bosses 112 arranged symmetrically with respect to the axis of the threaded hole 111, the pressing force on the two IGBTs can be balanced and stable, thereby ensuring that each The heat dissipation of the IGBTs is relatively the same, which can improve the stability and reliability of the entire inverter operation.

It should be noted that, on the basis of meeting the requirements of the processing technology and the pressing force provided by the fixing device, the number of positioning bosses 112 in this solution can also be an even number arranged symmetrically with respect to the axis of the threaded hole 111 , such as 4, 6, and so on.

In order to ensure the normal operation of the inverter, two adjacent IGBT2 need to have a safe installation distance directly, as shown in Figure 2, the fixing device 1 provided by this solution also includes a first rib 113 arranged on the main body 11, the The length of the first reinforcing rib 113 is the required safe installation distance. Obviously, by setting the first reinforcing rib 113, the operator does not need to consider the safe installation distance of the two IGBTs during the installation process, thereby reducing its labor intensity and improving work efficiency. At the same time, the work of the inverter is guaranteed. reliability and security.

Further, as shown in FIG. 2 , the contact surface 114 on the fixing device 1 and the IGBT2 is specifically an arc surface, the purpose of which is not only to enhance the strength of the fixing device 1, but also to provide the corresponding IGBT and heat dissipation device in the fixing device 1. On the basis of close fit requirements, the IGBT and the fixed device 1 are in line contact, which can reduce the contact area between the fixed device 1 and the IGBT2, thereby further improving the heat dissipation effect of the IGBT, thereby improving the working efficiency of the inverter, and extending the its service life. As can be seen from FIG. 2 , a second reinforcing rib 115 is provided on the side opposite to the first reinforcing rib 113 , which can further enhance the strength of the fixing device 1 .

In addition, on the basis of reducing the contact surface between the fixing device 1 and the IGBT2 to improve the heat dissipation effect of the IGBT2, in order to further balance the pressing force applied by the fixing device 1 to the IGBT, the arc surface of the fixing device 1 is in line with the middle part of the IGBT. cut settings.

Of course, on the basis of meeting the IGBT heat dissipation requirement and the pressing force requirement, the contact surface between the fixing device 1 and the IGBT in this solution can also be a plane or other shapes different from this solution.

Some functional components inside IGBT2 are made of crystalline silicon, and crystalline silicon will easily damage the metal material when it is subjected to a large external force. The fixing device in the IGBT is made of plastic, and its hardness is lower than that of metal to ensure the safety and reliability of the internal functional components of the IGBT.

It should be noted that the IGBT in this solution can be made of other materials whose hardness is lower than that of metal materials, in order to meet the processing technology requirements and the pressing force requirements when the IGBT is fixedly connected to the heat sink.

In addition to the above-mentioned fixing device for the inverter IGBT, the present invention also provides an inverter, including the IGBT and the heat dissipation device, and the heat dissipation bottom plate of the IGBT and the heat dissipation device is fixedly connected through the fixing device, and the fixing device is specifically as described above the fixtures described above. It can be understood that the basic functional components and working principles of the inverter are basically the same as those of the prior art, and those skilled in the art can fully implement them based on the prior art, so details will not be described herein.

In addition, the present invention also provides a solar AC power generation system, including a solar photovoltaic module, a controller, an electric storage device and an inverter, and the inverter is specifically the above-mentioned inverter. It can be understood that the basic functional components and working principles of the solar AC power generation system are basically the same as those of the prior art, and those skilled in the art can fully implement them based on the prior art, so details will not be repeated here.

The above descriptions are only preferred embodiments of the present invention, and do not constitute a limitation to the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (8)

1. A fixing device (1), comprising a main body (11), the main body (11) presses and fixes the fixed part (2) to the carrier through a threaded assembly, characterized in that the main body (11) also At least one positioning boss (112) is provided to limit the rotation of the main body (11) relative to the fixed part (2); The shape of the main body (11) is rectangular, and the threaded hole (111) compatible with the threaded assembly is opened in the middle of the main body (11), and the number of the positioning bosses (112) is relative to the The axis of the threaded hole (111) is an even number arranged symmetrically from left to right, and the contact surface (114) on the main body (11) and the fixed part (2) is an arc surface; along the screwing direction of the threaded assembly , the diameter of the positioning boss (112) decreases gradually. 2. The fixing device according to claim 1, characterized in that, along the screwing direction of the screw assembly, the positioning boss (112) is provided with a groove (112-1). 3. The fixing device according to claim 1 or 2, characterized in that, the arc surface (114) is tangent to the middle part of the fixed part (2). 4. The fixing device according to claim 3, characterized in that, along the length direction, both ends of the main body (11) are provided with first reinforcing ribs (113) and second reinforcing ribs (115). 5. The fixing device according to claim 4, characterized in that, the length of the first reinforcing rib (113) is the safe installation distance of two adjacent fixed parts (2). 6. The fixing device according to claim 1, characterized in that, the main body (11) is made of plastic. 7. An inverter, comprising an IGBT and a heat sink, the IGBT is fixed to the heat sink by a fixing device, wherein the fixing device is specifically the fixing device described in any one of claims 1 to 6 device. 8. A solar AC power generation system, comprising a solar photovoltaic module, a controller, an electrical storage device and an inverter, wherein the inverter is specifically the inverter according to claim 7.